diff --git a/schala-lang/language/src/tree_walk_eval/test.rs b/schala-lang/language/src/tree_walk_eval/test.rs
index 915658f..0b351ea 100644
--- a/schala-lang/language/src/tree_walk_eval/test.rs
+++ b/schala-lang/language/src/tree_walk_eval/test.rs
@@ -390,6 +390,27 @@ fn chnurmek(a: Int): Int {
 }
 
 (chnurmek(5), chnurmek(0))
-"#;
+    "#;
     eval_assert(source, r#"(9999, 2)"#);
+
+    let source = r#"
+fn marbuk(a: Int, b: Int): (Int, Int) {
+   if a == 5 then {
+        if b == 6 then {
+            return (50, 50);
+        }
+
+        return (a, b + 1)
+   }
+   (a * 100, b * 100)
+}
+
+let x = marbuk(1, 1)
+let y = marbuk(5, 1)
+let z = marbuk(5, 6)
+
+(x, y, z)
+    "#;
+    eval_assert(source, "((100, 100), (5, 2), (50, 50))");
+
 }